package com.swagger.demo.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * creat by
 *
 * @author heyang
 * @date 2020/9/10 15:51
 */
public class ThreadDateUtil {
    /**
     *  日期格式1
     */
    public static final String                          yyyyMMddHHmmsss = "yyyyMMddHHmmsss";
    /**
     *  日期格式2
     */
    public static final String                          yyMMddHHmmsss   = "yyMMddHHmmsss";

    /**
     *   默认格式
     */
    private static final String                         DEFAULT_FORMAT  = "yyyy-MM-dd HH:mm:ss";

    /**
     *  格式化 线程集
     */
    private static Map<String, ThreadLocal<DateFormat>> threadLocalMap  = new HashMap<>();

    /**
     *    获取日期格式化工具对象
     *    线程安全
     * @return
     */
    public static DateFormat getDateFormat() {
        return getDateFormat(DEFAULT_FORMAT);
    }

    /**
     *  获取日期格式化工具对象
     *      线程安全
     * @param format    格式      可取些工具类中的常量格式，默认为yyyy-MM-dd HH:mm:ss
     * @return
     */
    public static DateFormat getDateFormat(String format) {
        ThreadLocal<DateFormat> threadLocal = threadLocalMap.get(format);
        DateFormat df = null;
        if (threadLocal == null) {
            threadLocal = new ThreadLocal<DateFormat>();
            df = new SimpleDateFormat(format);
            threadLocal.set(df);
            threadLocalMap.put(format, threadLocal);
        } else {
            df = threadLocal.get();
            if (df == null) {
                df = new SimpleDateFormat(format);
                threadLocal.set(df);
                threadLocalMap.put(format, threadLocal);
            }
        }
        return df;
    }

    public static String formatDate(Date date) throws ParseException {
        return getDateFormat().format(date);
    }

    public static Date parse(String strDate) throws ParseException {
        return getDateFormat().parse(strDate);
    }
}
